Sawing of logs



Aug. 1, 1933- K. E. R. OSTERBERG SAWING OF LOGS Filed Oct. 1, 1932 Patented Aug. 1, 1933 SAWING F LOGS Karl Erik Rudolf (isterberg, Stockholm, Sweden,

assignor to J. & O.

G. Boiinders Mekaniska Verkstads Aktiebolag, Stockholm, Sweden, a Joint-Stock Company of Sweden Application October 1,

1932, Serial No. 635,827,

and in Sweden November 14, .1931

16 Claims.

The present invention refers to an arrangement to bring about proper guidance of the lumber behind the saw blade. or saw blades, for instance in a log frame, in such a manner that the sawing operation will be effected properly without the use of any log carriage or trolley behind the log frame, and without causing crookedness and bends in the lumber sawn. Hereby the clamping is a plan view of the same. Fig. 3 is a section on line 3-3 in Fig. 2 and Fig. 4 is a section on line 4-4 in Fig. 2. V d

The arrangement comprises fixed guide knives 5, 6 immediately behind the saw blades 3, 4 and one or more sets of guide knives 7, 8 adjustable in the plane of the saw blades, said guide knives being located farther out from the log frame,

while being also adjustable, so that the distance between the knives of each set can be made equal to the distance between the fixed knives, which are adjusted and locked for the dimension of the block to be sawn.

For adjustment of the fixed knife 5 I have shown a handle 18 detachably arranged on a threaded spindle 19 rotatably mounted in the support in which the spindle is secured against axial displacement. The knife 6 is secured to a slide 21 which by means of athreaded bore therein is slidably arranged on the spindle 19. Thus it is clear that when the spindle-19 is rotated by means of the handle 18 the slide 21 and the knife 6 will be moved sideways at right angles to the direction of feed of the logb For adjusting the knife 5 the handle 18 is moved to another threaded spindle 22 and operated as described in corn nection with the knife 6. The guide knives 7 and 8 may be adjusted in the same way as the knives 5 and 6 but I prefer to use the arrangement shown in Fig. 4, in which the knives '7 and dare slidably arranged on a shaft 9. By means of clamping-screws. or setscrews 23 they may be immovably secured to the shaft in any desired position.

The pairs of knives located farther from the frame may be'brought down either into line I with the log 2, or at right angles toward the side, or, they may be moved straight down so as to come under the level of the supporting plane of the logs.. It is also possible to arrange the guide knives located farther from the log frame above the log, and so that they can be removed in a similar manner. Hereby conveying of the sawn log to the side is made possible when the sawing is finished. During the sawing operation the parallel sides of the log thus slide between two rows of parallel knives entering the saw kerfs, these knives thus preventing turning of the log and deviation of the same from the straight line course. The log is carried by a number of carrying rollers 12 which may be caused to rotate when the sawing of the log has been finished. Although not shown in the drawing, the various sets of guide knives may be arranged in any suitable manner to be adjusted mutually in the direction of feed of the logs.

The arrangement operates in the following manner. The log is fed into the log frame with the aid of a log carriage running on the rails 1. When the front end of the log 2 has passed the saw blades 3 and 4, the fixed guide knives 5 and 6 enter the saw kerfs produced in the sawin operation. The guide knives 7 and 8 are clamped to the shaft 9 in agreement with the log dimension sawn. The shaft .9 is mounted in a trestle 17 placed Lmder the supporting plane of the log. Secured to the end of the shaft 9 is an arm 10 engaged by a hook 11 provided at the one end of a pivotally mounted bell crank lever. Hereby the guide knives 7 and 8 are prevented from being brought down on account of the friction against the log which is advanced in the direction of the arrow. As soon as the log has been advanced so far that it has been released by the feed rollers of the log frame or the guide knives 5 and 6, the rollers 12 are brought into movement, so that the log continues to move in the direction of the arrow. At' the same time the hook 11 is released through a treadle device 13, 14 or the like. By reason of the friction between the log and the guide knives '7 and 8 the latter follow the log in its movement so that they will be brought down along the supporting plane of the rollers. The log will then be free to be rolled toward the side to the next log frame,while the side scantlings continue to move straight forward on the rollers. As soon as the log has been removed, the guide knives '7 and 8 againrise into the vertical plane by means of a, weight 15, a spring or the like, the arm 10 being locked by the hook 11 which is actuated by a spring 16. 7 It is also possible to bring the guide knives out of or into the path of the movement of the log by means of levers or a treadle.

The construction of the arrangement may obviously be varied in different ways while paying due regard to the principle of the invention, which involves the making of the log carriage behind the saw blades superfluous, by arranging two or more fixed guide knives beside the saw blades, said guide knives being adjustable with respect to theirmutual distance, while one or more sets of adjustable guide knives are arranged farther from the saw blades, so that at least one of the knives of each set may be moved away, so that the log can be moved to the side, Without being hampered by the guide knives. The expression guide knives are obviously intended to comprise guide members of any suitable construction, and the invention consequently is not limited to the number or shape of these members.

What I claim is:

1.,In a sawing machine, a saw blade, a guiding member behind said saw blade and entering the saw kerf for guiding the material sawn, a second guiding member farther away from' the saw blade, and means for bringing said second guiding member-out of guiding function.

2. In a sawing machine, a set of saw blades, a set of guiding members behind said saw blades and entering the saw kerfs for guiding the material sawn, a second set of guiding members more remote'from -said saw blades, and means for bringing said second set of guiding members out of guiding function. 3. A sawing machine as claimed in claim 2, in

which each set of guiding members comprises at least two guiding knives.

4. In a sawing machine, a set of saw blades, 2. set of guiding members behind said saw blades and entering the saw kerfs for guiding the material sawn, a second set of guiding members more remote from said sawblades, means for bringing said second set of guiding membersout of guiding function, and means for adjusting the guiding members of each set in relation to each other and at an angle to the direction of feed of the material to be sawn.

5. Ina sawing machine, a set of saw blades, a set of guiding members behind said saw blades and entering the saw kerfs for guiding the material sawn, a second set of guiding members more remote from said'saw blades, means for bringing at least one of the guiding members of said second set out of the path of movement of the material sawn in order to facilitate removal of said material sideways.

6. In a sawing machine, a saw frame, saw blades in said saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades than said guiding knives, a shaft rotatably mounted in said support,

a second set of guiding knives slidably arranged on said shaft,and'means for locking said knives in 'a determined position on said shaft. '7. In, a sawing machine,'a saw frame, saw blades in said saw'fraine, a set of guiding knives behind saw blades and entering the saw on said shaft, means for locking said knives in a determined position on said shaft, said locking means comprising clamping screws for securing said knives to said shaft.

8. In a sawing machine, a saw frame, saw blades in said saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades than said guiding knives, a shaft rotatably mounted in said support, a second set of guiding knives slidably arranged on said shaft, means for locking the knives of said second set in an upright position on said shaft, and means for bringing at least one of the knives of said second set out of guiding function.

9. In a sawing machine, a saw frame, saw blades in said saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades then said guiding knives, a shaft rotatably mounted in said support, a second set of guiding knives slidably arranged on said shaft, means for locking the knives of said second set in an upright position on said shaft, said means comprising an arm extending from said shaft and a hook pivotally mounted in said support and engaging said arm.

10. In a sawing machine, a saw frame, saw

blades in said saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades than said guiding knives, a shaft rotatably mounted in said support, a second set of guiding knives slidably arranged on said shaft, means for locking the knives of said second set in an upright position on said shaft, said means comprising an arm extending from said shaft and a hook pivotally mounted in said support and engaging said arm, and means for bringing said hook out of engagement with said arm, in order to release the shaft carrying the second set of guiding knives.

11. A sawing machine as claimed in claim 10, wherein the means for releasing the second set of guiding knives comprises a treadle device actuating said hook and being situated adjacent said second set of guiding knives.

12. In a sawing machine, a saw frame, saw blades insaid saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades than said guiding knives, a shaft rotatably mounted in said support, a second set of guiding knives arranged on said shaft, means for automatically bringing said second set of guiding knives to occupy an upright position, and means for locking the guiding knives in said upright position.

13. In a sawing machine, a saw frame, saw blades in said saw frame, a set of guiding knives behind said saw blades and entering the saw kerfs for guiding the log sawn, a support more remote from the saw blades than said guiding knives, a shaft rotatably mounted in said support, a second set of guiding knives arranged on said shaft, 2. weight secured to said shaft opposite said guiding knives, said weight being sufficiently heavy to bring said knives to take an upright position, and means for locking the guiding knives in said upright position.

14. In a sawing machine, a set of saw blades, a set of guiding members behind said saw blades andentering the saw kerfs for guiding the material sawn, a second set of guiding members more remote from said saw blades, and means for adjusting the relative position of the two sets 16. In a sawing machine, a set of saw blades, a support behind said saw blades, a threaded spindle rotatably mounted in said support, a slide slidably arranged on said spindle, a guiding member on said slide, said guiding member being adapted to enter a saw kerf for guiding the material sawn, and means for rotating said spindle, to adjust the position of said guiding member at an angle to the direction of feed of the material sawn.

KARL ERIK RUDOLF OSTERBERG; 

